首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >Lattice-dynamical estimation of atomic displacement parameters in carbonates: Calcite and aragonite CaCO3, dolomite CaMg(CO3)(2) and magnesite MgCO3
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Lattice-dynamical estimation of atomic displacement parameters in carbonates: Calcite and aragonite CaCO3, dolomite CaMg(CO3)(2) and magnesite MgCO3

机译:碳酸盐中原子位移参数的晶格动力学估计:方解石和文石CaCO3,白云石CaMg(CO3)(2)和菱镁矿MgCO3

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摘要

Using crystallographic information and empirical potentials derived from fitting the vibrational frequencies of all the substances under study, together with those of a group of silicates and oxides, a Born-von Karman rigid-ion lattice-dynamical model has been applied to the whole Brillouin zone in calcite, aragonite (alpha- and beta-CaCO3, respectively), magnesite (MgCO3) and dolomite [CaMg(CO3)(2)]. The Raman and IR spectra are satisfactorily reproduced and interpreted by these calculations; there is also very good agreement with atomic anisotropic displacement parameters (a.d.p.'s) derived from accurate crystal structure refinement by various authors and with the experimental values of thermodynamic functions over a wide range of temperatures. On these vibrational grounds, the stability of calcite with respect to aragonite at high temperature can be accounted for. [References: 40]
机译:利用晶体学信息和拟合研究中所有物质的振动频率得出的经验势以及一组硅酸盐和氧化物的振动势,将Born-von Karman刚性离子晶格动力学模型应用于整个布里渊区在方解石,文石(分别为α-和CaCa3),菱镁矿(MgCO3)和白云石[CaMg(CO3)(2)]中。通过这些计算可以令人满意地再现和解释拉曼光谱和红外光谱。各种作者从精确的晶体结构细化得到的原子各向异性位移参数(a.d.p.)与在宽温度范围内的热力学函数的实验值也有很好的一致性。基于这些振动,可以解释方解石对文石在高温下的稳定性。 [参考:40]

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